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B. S. OOMSTOGK.

STEAM GENERATOR.

Pam tented June 17, 1884'.

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BENJAMIN S. COMSTOGK, OF NEW' YORK, Y.

STEAM-GENERATO R.

fiPECIPICATION forming part of Letters Patent No. 300,4:16, dated June1'7, 1884.

Application filed February 17, 1882, (N0 model.)

To all 2071/0122, it may concern:

Bcitknown that I, BENJAMIN S. OoMsTocK, of the city of New York, in thecounty and State of New York, have invented certain new and usefulImprovements in Steam Generators, which improvements are fully set forthin the following specification and accompanying drawings.

The object of my invention is to more thoroughly utilize the heatgenerated by the combustion of the fuel, and to adapt the parts to eachother in the manner best fitted to combine simplicity and lightness ofconstruction with water and steam tight jointure.

My invention consists in constructing the inner and outer walls of theannular water chamber of a steam-generator in away best adapted toeffectively utilize the heat, the outer wall being a cylinder jointed atits top and bottom into cast-metal sections, and the inner wall atruncated cone jointed at its top and bottom in like manner, each wallbeing preferably a single piece of sheet metal.

It also consists in the combinatiomwith the water-chamber, of afuel-magazine separated therefrom by an intervening annular space in theform of a truncated cone, such space constituting a flue for thecombustion-chamber, and a hot-air chamber surrounding the waterchaniber.

In the accompanying drawings, Figure 1 represents a front elevation ofmy improved steamgenerator in vertical section. Fig. 2 is a plan view ofthe same, partly in section.

In these drawings, a represents the outer wall of a hot-air chamber, A,surrounding the entire generator, which wall rests upon a suitable base,H, of cast metal. The chamber A is covered by a suitable metal top, E,the center of which is provided with a cast-metal collar, E, for holdingin position and supporting a sheet-metal wall, 0. The wall ,0 forms theinclosing wall for the upper portion of a fuelmagazine, D, which isprovided with a suitable lid or cover, (1, resting upon the collar E.

To the lower edge of the wall 0 is secured a cast-metal section, 0,which incloses thelower portion of the fuel'magazine and surmounts acombustion-chamber, F, and, like the wall a, is constructed in the formof a truncated cone. This portion of the combustion-chamber may alsohave, when necessary, extension-pieces resting upon the grate or base,in order to better support the same.

An annular water-chamber, B, surrounds the fuel-magazine D, but isseparated there from by an intervening space, G, constituting a flue forthe escape of the gases and smoke from the combustion-chamber F. Theouter wall of the water-chamber B consists of a cylinder, b, preferablyof a single piece of sheet metal supported upon an annular casting, Dwhich rests upon the base 9 of the combustionchambcr. The inner wall, D,is constructed in the form of a truncated cone, likewise preferably of asingle piece of sheet metal,and fitted at its lower edge into theannular casting b. This inner wall may be corrugated, if deemednecessary, in order to afford a greater heating-surface.

Upon the upper edges of the walls b and I) is supported an annular top,2), preferably of cast metal, jointed therewith by means of the groovesand flanges f. The top b is held tightly in position by means ofsuitable bolts, 75, extending therefrom through the lower casting, b, orby lateral bolts, as hereinafter described. The inner wall,b,of thewater-chamber converges toward its top, that the flames and hot air fromthe combustion-chamber may impinge" against it with greater force andthrough a greater distance as they escape through the flue C andsmokepipe c. The

heat developed in the combustion-chamber will thus be more completelycommunicated to the water contained in the chamber B, particularly atits lower part, where the steam is most rapidly generated.

The grateGmaybe constructed in one piece with the base H, as indicatedin the drawings, or it may be constructed separately in any well-knownmanner. In either case, however, I prefer to provide it with a circularshoulder, g, and lateral perforations therein, as shown in the drawings,leading into the chamber A, to allow the hot air and gases from thecombustion chamber to circulate about the outer wall of thewater-chamber. It is evident, however, that the hot-air chamber A andsaid circular shoulder g, as described,may be dispensed with and thewall 0 supported from the top 11 0f the water-chamber. A suitable pipe,N, is provided for conducting the steam from the water-chamber B, and apipe,

N, for replenishing the same. Suitable air and safety-valve devices maybe applied to a pipe, N, also leading from the water-chamber, whichlatter is supplied with gage-cocks.

The joints of the waterchamber are preferably made steam-tight byfitting the sheet-metal )ortions b and 1) into annular rooves in thecastings I) and b", respectively, packing the same with a filling ofprepared .asbestus, and binding the same in their relative positions bymeans of the bolts k. In order to sustain a greater steam-pressure, itmay sometimes be preferable to hold the shcct-metal portions in positionin the cast-metal sections by means of lateral bolts or rivets extendingthrough the cast-m etal flanges and grooves and the ends of thesheet-metal sections fitted therein.

I am aware that it is not new to construct the inner and outer walls ofa waterchamber each of a single piece of metal, and to joint the sameinto cast-metal. sections.

I am aware, also, that it is not new to con struct an annularwater-chamber with a converging inner wall, and to combine the'same witha conical central water-chamber, formcon1bustion-chamber, having a gratewith a circular shoulder and perforations therein, with the annularwater-chamber, an enveloping cylinder forming a hot-air chamber, and aconical fuel-magazine depending from the top of said cylinder.

BENJAMIN S. OOB'ISTOGK.

NVitnesses:

GEORGE LEwIs PRENTIss, J12, GEORGE H. SULLIVAN.

